Frequency adjustable dynamic vibration absorber for ship inclined ladder

Abstract

The present application provides a frequency-adjustable dynamic vibration absorber for a ship's inclined ladder. It includes an L-shaped connecting part, which includes two vertically arranged connecting shells, and independent cavities are respectively arranged in the two connecting shells, and an independent vibration damping mechanism is arranged in each cavity. The vibration damping mechanism includes a connecting rod, a mass block, a spring, and a plurality of damping holes. The connecting rod is connected to both ends of the connecting shell, the mass block slides along the connecting rod, and the springs are respectively arranged on both sides of the mass block. When the mass block reciprocates along the axial direction of the connecting rod, the damping fluid filled in the cavity of the connecting shell flows between the two cavities through the damping hole. The present application is arranged on the back of the ship's inclined ladder to absorb the lateral and vertical vibrations of the inclined ladder, prevent the abnormal vibration of the inclined ladder or handrail from affecting the use of personnel and the safety of the structure, and occupy a small space without affecting the normal use of the inclined ladder and the external space. The present application has a simple structure, strong practicality, and a stable structure, which can meet the stable use of the ship under the harsh working conditions of shaking at sea.

Description

Technical Field

[0001] The present application relates to the technical field of ship vibration reduction, and in particular to a frequency-adjustable dynamic vibration absorber for a ship inclined ladder. Background Art

[0002] There are various electromechanical equipment arranged on the deck of a liquefied gas carrier, which will generate vibrations during operation. For example, the reciprocating compressor on a liquefied gas carrier will cause abnormal vibrations on the deck during operation.

[0003] The deck is usually equipped with a ship inclined ladder for passage. The bottom of the ship inclined ladder is connected to the deck, and the top of the ship inclined ladder extends to a predetermined height. Since the ship inclined ladder will resonate with the vibration of the deck, it will seriously affect its normal use and even cause structural fatigue damage due to excessive vibration.

[0004] In summary, it is necessary to provide an improved technical solution to address the above-mentioned deficiencies in the prior art. Summary of the invention

[0005] The purpose of the embodiments of the present application is to provide a frequency-adjustable dynamic vibration absorber for a ship's inclined ladder, so as to solve the technical problem of abnormal lateral and vertical vibrations of the ladder frame or handrails of the inclined ladder during the navigation of the ship.

[0006] In a first aspect, a frequency-adjustable dynamic vibration absorber for a ship's inclined ladder is provided, comprising an L-shaped connecting portion, which is used to be fixedly connected to the back side of the ship's inclined ladder, and comprises two vertically arranged connecting shells, each of which has an independent cavity arranged in it, and each of the cavities has an independent vibration damping mechanism arranged in it.

[0007] The vibration damping mechanism comprises a connecting rod, a mass block, a spring and a plurality of damping holes.

[0008] The connecting rod is connected to both ends of the connecting shell and is arranged parallel to the axial direction of the connecting shell. The mass block is sleeved on the connecting rod and slides along the connecting rod, and the mass block divides the cavity in the connecting shell into two parts. The spring includes a first spring and a second spring, which are respectively arranged on both sides of the mass block and sleeved on the connecting rod. A plurality of damping holes are arranged on the mass block, and when the mass block reciprocates along the axial direction of the connecting rod, the damping fluid filled in the cavity of the connecting shell flows between the two cavities through the damping holes.

[0009] In one embodiment, the present application also includes an adjustment plate threadedly connected to the connecting rod, and the position of the adjustment plate on the connecting rod is adjusted by threads; the adjustment plate is arranged in the connecting shell, one end of the spring is connected to the connecting shell, and the other end of the spring is connected to the adjustment plate.

[0010] In one embodiment, a second threaded hole is provided at the center of the adjustment plate, and the adjustment plate is threadedly connected to the connecting rod through the second threaded hole.

[0011] In one embodiment, the connecting shell is a rectangular shell, the adjusting plate is a rectangular plate, and the adjusting plate is clamped inside the connecting shell; the position of the adjusting plate on the connecting rod is adjusted after the connecting rod rotates.

[0012] In one embodiment, both ends of the connecting rod are connected to the connecting shell through a first nut and a second nut respectively, the first nut is arranged on the same side as the adjustment plate, a first adjustment hole is arranged on the first nut, and a second adjustment hole is arranged on the connecting rod at a position corresponding to the first adjustment hole, a rod-shaped object can be inserted into the first adjustment hole and the second adjustment hole, and the connecting rod is rotated by rotating the rod-shaped object.

[0013] In one embodiment, a limit block is provided on the connecting rod, and the limit block is fixedly connected to a predetermined position of the connecting rod to limit the movable range of the adjustment plate.

[0014] In one embodiment, the connecting rod includes a threaded section and a smooth section, and the adjustment plate is threadedly connected to the threaded section; the limit block is arranged at the intersection of the threaded section and the smooth section.

[0015] In one embodiment, the diameter of the limit block is smaller than the inner diameter of the spring.

[0016] In one embodiment, an extension plate is disposed outside the connection shell, and the extension plate is detachably connected to the ship structure.

[0017] In one embodiment, the connecting shell is a closed shell, and a through hole is respectively provided at both ends of the connecting shell, and both ends of the connecting rod extend out through the two through holes respectively; a sealing portion is provided between the first nut on the connecting rod and the connecting shell.

[0018] Compared with the prior art, the beneficial effects of this application are:

[0019] In the technical solution of the present application, the present application is arranged on the back of the inclined ladder of the ship to absorb the lateral and vertical vibrations of the inclined ladder, prevent the abnormal vibration of the inclined ladder or handrail from affecting the use of personnel and structural safety, and occupy a small space without affecting the normal use of the inclined ladder and the external space. The present application has a simple structure, strong practicality, and a stable structure, which can meet the requirements of stable use under the harsh working conditions of the ship shaking at sea.

[0020] When subjected to horizontal or vertical vibration, the mass block reciprocates along the axis of the connecting rod under the action of the first spring and the second spring, thereby absorbing the vibration of the inclined ladder and converting it into the kinetic energy of the mass block and the elastic potential energy of the spring. During the reciprocating motion of the mass block, the volume of the cavities on both sides of the mass block continuously changes dynamically, so that the damping fluid continuously flows through the damping hole, thereby producing a greater damping effect.

[0021] The stiffness of the spring and the size of the mass block can be designed separately according to the vibration level in the corresponding direction, thereby achieving independent vibration reduction effects in two directions.

[0022] By manually adjusting the position of the adjustment plate on the connecting rod, the preload displacement of the spring is changed, so that the present application is a frequency-adjustable vibration absorber, which increases the scope of application. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of a frequency-adjustable dynamic vibration absorber for a ship inclined ladder according to an embodiment of the present invention.

[0024] Figure 2 It is a structural schematic diagram of a connection shell in a frequency-adjustable dynamic vibration absorber for a ship inclined ladder according to an embodiment of the present invention.

[0025] Figure 3 It is a structural schematic diagram of a connecting rod in a frequency-adjustable dynamic vibration absorber for a ship inclined ladder according to an embodiment of the present invention.

[0026] Figure 4 It is a structural schematic diagram of an adjustment plate in a frequency-adjustable dynamic vibration absorber for a ship inclined ladder according to an embodiment of the present invention.

[0027] Figure 5 It is a structural schematic diagram of a first nut in a frequency-adjustable dynamic vibration absorber for a ship inclined ladder according to an embodiment of the present invention.

[0028] Figure 6 It is a structural schematic diagram of a mass block in a frequency-adjustable dynamic vibration absorber for a ship inclined ladder according to an embodiment of the present invention.

[0029] The reference numerals are described as follows:

[0030] 1 Inclined ladder platform

[0031] 2 Inclined ladder rack

[0032] 3 Connect the housing

[0033] 301 Square Tube

[0034] 302 Connecting plate

[0035] 303 extension plate

[0036] 4 Connecting rod

[0037] 401 Limit block

[0038] 402 Second adjustment hole

[0039] 5 Spring

[0040] 6 Mass

[0041] 601 Through Hole

[0042] 602 Damping hole

[0043] 7 Adjustment plate

[0044] 701 Second threaded hole

[0045] 8 First nut

[0046] 801 First threaded hole

[0047] 802 First adjustment hole

[0048] 9 Mounting bolts DETAILED DESCRIPTION

[0049] The specific embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings. These embodiments are only used to illustrate the present invention, but not to limit the present invention.

[0050] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0051] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0052] Furthermore, in the description of the present invention, unless otherwise specified, “plurality” means two or more.

[0053] See also Figures 1 to 6 The present application provides a frequency-adjustable dynamic vibration absorber for a ship's inclined ladder, comprising an L-shaped connection portion, the L-shaped connection portion being used for fixed connection with the back of the ship's inclined ladder, and comprising two vertically arranged connection shells 3, each of which is provided with an independent cavity, and each cavity is provided with an independent vibration damping mechanism. The two sets of vibration damping mechanisms can be designed separately according to the vibration levels in the corresponding directions, thereby achieving independent vibration damping effects in two directions.

[0054] It should be noted that if Figure 2 As shown, two vertically arranged connection housings 3 are fixedly connected via a connection plate 302 .

[0055] The vibration damping mechanism includes a connecting rod 4, a mass block 6, a spring 5 and a plurality of damping holes 602. The connecting rod 4 is connected to both ends of the connecting shell 3 and is arranged parallel to the axial direction of the connecting shell 3. A through hole 601 is arranged at the center of the mass block 6. The mass block 6 is sleeved on the connecting rod 4 through the through hole 601 and slides along the connecting rod 4. The mass block 6 divides the cavity in the connecting shell 3 into two parts. The spring 5 includes a first spring and a second spring, which are respectively arranged on both sides of the mass block 6 and sleeved on the connecting rod 4. A plurality of damping holes 602 are arranged on the mass block 6. When the mass block 6 reciprocates along the axial direction of the connecting rod 4, the damping fluid filled in the cavity of the connecting shell 3 flows between the two cavities through the damping holes 602. The damping fluid is a flowing liquid, such as water or hydraulic oil.

[0056] It should be noted that the size and number of the damping holes 602 in the present application can be adjusted as needed. Figure 6 As shown, six damping holes 602 are evenly distributed on the mass block 6 .

[0057] In one embodiment, Figure 1 and Figure 4 As shown, the present application further includes an adjustment plate 7 threadedly connected to the connecting rod 4, and the position of the adjustment plate 7 on the connecting rod 4 is adjusted by the thread; the adjustment plate 7 is arranged in the connecting housing 3, one end of the spring 5 is connected to the connecting housing 3, and the other end of the spring 5 is connected to the adjustment plate 7. By setting the position of the adjustment plate 7 on the connecting rod 4, the preload displacement of the spring 5 is changed, so that the present application is a frequency-adjustable vibration absorber, and the scope of application is increased.

[0058] Specifically, a second threaded hole 701 is provided at the center of the adjustment plate 7 , and the adjustment plate 7 is threadedly connected to the connecting rod 4 through the second threaded hole 701 .

[0059] In one embodiment, the connection housing 3 includes a square tube 301, and the adjustment plate 7 is a rectangular plate corresponding to the cross-sectional shape of the square tube 301. The adjustment plate 7 is clamped inside the connection housing 3; the position of the adjustment plate 7 on the connection rod 4 is changed by rotating the connection rod 4, and a screw nut mechanism is formed between the connection rod 4 and the adjustment plate 7. Without disassembling the connection housing 3, the position of the adjustment plate 7 arranged inside is adjusted only by rotating the extended part of the connection rod 4.

[0060] In one embodiment, both ends of the connecting rod 4 are connected to the connecting housing 3 through a first nut 8 and a second nut, respectively, and the first nut 8 is arranged on the same side as the adjusting plate 7. Figure 5 As shown, a first adjustment hole 802 is provided on the first nut 8, a first threaded hole 801 is provided on the first nut 8, the first nut 8 is installed on the connecting rod 4 through the first threaded hole 801, and the first adjustment hole 802 is vertically provided to the first threaded hole 801; a second adjustment hole 402 is provided at a position corresponding to the first adjustment hole 802 on the connecting rod 4; a rod-shaped object can be inserted into the first adjustment hole 802 and the second adjustment hole 402, and the connecting rod 4 is rotated by rotating the rod-shaped object.

[0061] Specifically, by loosening the first nut 8, the first adjustment hole 802 on the first nut 8 is aligned with the second adjustment hole 402 on the connecting rod 4, and a rod-shaped object is inserted into the first adjustment hole 802 and the second adjustment hole 402, and the connecting rod 4 is rotated by rotating the rod-shaped object to change the position of the adjustment plate 7 on the connecting rod 4. After the position of the adjustment plate 7 is adjusted, the rod-shaped object is removed and the first nut 8 is tightened.

[0062] In one embodiment, Figure 1 and Figure 3 As shown, a limit block 401 is provided on the connecting rod 4, and the limit block 401 is fixedly connected to a predetermined position of the connecting rod 4 to limit the range of motion of the adjustment plate 7. The position of the limit block 401 is the maximum displacement position of the adjustment plate 7.

[0063] In one embodiment, the connecting rod 4 includes a threaded section and a smooth section, and the adjusting plate 7 is threadedly connected to the threaded section; the limiting block 401 is disposed at the junction of the threaded section and the smooth section.

[0064] In one embodiment, the diameter of the limit block 401 is smaller than the inner diameter of the spring 5 , thereby preventing the limit block 401 from affecting the normal operation of the spring 5 .

[0065] In one embodiment, Figure 2 As shown, the free end of the connecting shell 3 extends outwardly through an extension plate 303 , the horizontally arranged connecting shell 3 is fixedly connected to the inclined ladder platform 1 by means of mounting bolts 9 , and the vertically arranged connecting shell 3 is fixedly connected to the inclined ladder frame 2 by means of mounting bolts 9 .

[0066] Specifically, the connecting shell 3 is fixedly connected to the inclined ladder platform 1 and the inclined ladder frame 2 through the extension plate 303 and the connecting plate 302 .

[0067] In one embodiment, the connecting shell 3 is a closed shell, and a mounting hole is respectively provided at both ends of the connecting shell 3, and both ends of the connecting rod 4 extend out through the two mounting holes respectively; a sealing portion is provided at the connection between the connecting rod 4 and the connecting shell 3.

[0068] Specifically, the sealing part is a sealing ring or a rubber coating seal to prevent the damping fluid from leaking.

[0069] In summary, the present application is arranged on the back of the inclined ladder of the ship to absorb the lateral and vertical vibrations of the inclined ladder and prevent the abnormal vibration of the inclined ladder or handrail from affecting the use of personnel and the safety of the structure. When the present application is subjected to vibration in the horizontal direction or the vertical direction, the mass block 6 reciprocates along the axial direction of the connecting rod 4 under the action of the first spring and the second spring, thereby absorbing the vibration of the inclined ladder and converting it into the kinetic energy of the mass block 6 and the elastic potential energy of the spring 5. The damping effect is generated by the flow of the damping fluid. During the reciprocating motion of the mass block 6, the volume of the cavity on both sides of the mass block 6 continues to change dynamically, so that the damping fluid continuously flows through the damping hole 602, thereby generating a larger damping effect. The stiffness of the spring 5 and the size of the mass block 6 can be designed separately according to the vibration level in the corresponding direction, so as to achieve independent vibration reduction effects in two directions. By manually adjusting the position of the adjustment plate 7 on the connecting rod 4, the preload displacement of the spring 5 is changed, so that the present application is a frequency-adjustable vibration absorber, which increases the scope of application.

[0070] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A frequency-adjustable dynamic vibration absorber for a ship's inclined ladder, characterized in that: include: The L-shaped connecting part is used for fixed connection with the back side of the ship's inclined ladder, and comprises two vertically arranged connecting shells, each of which is provided with an independent cavity, and each of which is provided with an independent vibration damping mechanism, and the vibration damping mechanism comprises: A connecting rod connected to both ends of the connecting shell and arranged parallel to the axial direction of the connecting shell; A mass block is sleeved on the connecting rod and slides along the connecting rod, and the mass block divides the cavity in the connecting shell into two parts; A spring, comprising a first spring and a second spring, which are respectively arranged on both sides of the mass block and sleeved on the connecting rod; A plurality of damping holes are provided on the mass block, and when the mass block reciprocates along the axial direction of the connecting rod, the damping fluid filled in the cavity of the connecting shell flows between the two cavities through the damping holes; An adjustment plate is threadedly connected to the connecting rod, and the position of the adjustment plate on the connecting rod is adjusted by threads; the adjustment plate is arranged in the connecting shell, one end of the spring is connected to the connecting shell, and the other end of the spring is connected to the adjustment plate.

2. The frequency-adjustable dynamic vibration absorber for a ship inclined ladder according to claim 1, characterized in that: A second threaded hole is arranged at the center of the adjusting plate, and the adjusting plate is threadedly connected to the connecting rod through the second threaded hole.

3. The frequency-adjustable dynamic vibration absorber for a ship inclined ladder according to claim 2 is characterized in that: The connecting shell is a rectangular shell, the adjusting plate is a rectangular plate, and the adjusting plate is clamped inside the connecting shell; the position of the adjusting plate on the connecting rod is adjusted after the connecting rod rotates.

4. The frequency-adjustable dynamic vibration absorber for a ship inclined ladder according to claim 3 is characterized in that: The two ends of the connecting rod are respectively connected to the connecting shell through a first nut and a second nut. The first nut is arranged on the same side as the adjustment plate. A first adjustment hole is arranged on the first nut. A second adjustment hole is arranged on the connecting rod at a position corresponding to the first adjustment hole. A rod-shaped object can be inserted into the first adjustment hole and the second adjustment hole, and the connecting rod is rotated by rotating the rod-shaped object.

5. The frequency-adjustable dynamic vibration absorber for a ship inclined ladder according to claim 4, characterized in that: A limit block is arranged on the connecting rod, and the limit block is fixedly connected to a predetermined position of the connecting rod to limit the movable range of the adjusting plate.

6. The frequency-adjustable dynamic vibration absorber for a ship inclined ladder according to claim 5, characterized in that: The connecting rod comprises a threaded section and a smooth section, the adjusting plate is threadedly connected to the threaded section; the limiting block is arranged at the intersection of the threaded section and the smooth section.

7. The frequency-adjustable dynamic vibration absorber for a ship inclined ladder according to claim 6, characterized in that: The diameter of the limiting block is smaller than the inner diameter of the spring.

8. The frequency-adjustable dynamic vibration absorber for a ship inclined ladder according to any one of claims 1 to 7, characterized in that: An extension plate is arranged outside the connection shell, and the extension plate is detachably connected to the ship structure.

9. The frequency-adjustable dynamic vibration absorber for a ship inclined ladder according to claim 4, characterized in that: The connecting shell is a closed shell, and a through hole is respectively provided at both ends of the connecting shell, and both ends of the connecting rod extend out through the two through holes respectively; a sealing part is provided between the first nut on the connecting rod and the connecting shell.

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